From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?xYF1a2FzeiBDemVyd2nFhHNraQ==?= Subject: Re: [RFC PATCH 6/6] spi: spi-s3c64xx: Move DMA initialization Date: Tue, 10 Sep 2013 15:16:59 +0200 Message-ID: <522F1BCB.1000400@samsung.com> References: <1378735766-12330-1-git-send-email-l.czerwinski@samsung.com> <1378735766-12330-7-git-send-email-l.czerwinski@samsung.com> <20130909145351.GD29403@sirena.org.uk> <522F0151.50905@samsung.com> <20130910120358.GG29403@sirena.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mailout3.w1.samsung.com ([210.118.77.13]:15469 "EHLO mailout3.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751335Ab3IJNRD (ORCPT ); Tue, 10 Sep 2013 09:17:03 -0400 In-reply-to: <20130910120358.GG29403@sirena.org.uk> Sender: linux-samsung-soc-owner@vger.kernel.org List-Id: linux-samsung-soc@vger.kernel.org To: Mark Brown Cc: s.nawrocki@samsung.com, linux-samsung-soc@vger.kernel.org, linux-spi@vger.kernel.org On 09/10/2013 02:03 PM, Mark Brown wrote: > On Tue, Sep 10, 2013 at 01:24:01PM +0200, =C5=81ukasz Czerwi=C5=84ski= wrote: > >> For 16kB buffer upload time is reduced from ~90ms to ~80ms (I tested >> with S5C73M3 355560B transfer). If you think that performance >> increase isn't valuable we should skip that patch. > > That does seem worthwhile. Is that just a single transfer in isolati= on? > I gave you summary time when firmware is transferred via 22x16kB blocks= =2E Each transfer was isolated. >> amba-pl80 uses virtual DMA channels support so driver won't occupy >> all the time physical channel. pl330 driver don't use such framework >> but It will be very hard to occupy all channels at the same time. If >> I'm wrong please correct me. > > OK. > Thanks Lukasz